Arid
DOI10.1111/j.1365-2486.2011.02534.x
Wind as a main driver of the net ecosystem carbon balance of a semiarid Mediterranean steppe in the South East of Spain
Rey, Ana1; Belelli-Marchesini, Luca2; Were, Ana1; Serrano-Ortiz, Penelope1; Etiope, Giuseppe3,4; Papale, Dario2; Domingo, Francisco1; Pegoraro, Emiliano1
通讯作者Rey, Ana
来源期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
出版年2012
卷号18期号:2页码:539-554
英文摘要

Despite the advance in our understanding of the carbon exchange between terrestrial ecosystems and the atmosphere, semiarid ecosystems have been poorly investigated and little is known about their role in the global carbon balance. We used eddy covariance measurements to determine the exchange of CO2 between a semiarid steppe and the atmosphere over 3 years. The vegetation is a perennial grassland of Stipa tenacissima L. located in the SE of Spain. We examined diurnal, seasonal and interannual variations in the net ecosystem carbon balance (NECB) in relation to biophysical variables. Cumulative NECB was a net source of 65.7, 143.6 and 92.1 g C m-2 yr-1 for the 3 years studied, respectively. We separated the year into two distinctive periods: dry period and growing season. The ecosystem was a net source of CO2 to the atmosphere, particularly during the dry period when large CO2 positive fluxes of up to 15 mu mol m-2 s-1 were observed in concomitance with large wind speeds. Over the growing season, the ecosystem was a slight sink or neutral with maximum rates of -2.3 mu mol m-2 s-1. Rainfall events caused large fluxes of CO2 to the atmosphere and determined the length of the growing season. In this season, photosynthetic photon flux density controlled day-time NECB just below 1000 mu mol m-2 s-1. The analyses of the diurnal and seasonal data and preliminary geological and gas-geochemical evaluations, including C isotopic analyses, suggest that the CO2 released was not only biogenic but most likely included a component of geothermal origin, presumably related to deep fluids occurring in the area. These results highlight the importance of considering geological carbon sources, as well as the need to carefully interpret the results of eddy covariance partitioning techniques when applied in geologically active areas potentially affected by CO2-rich geofluid circulation.


英文关键词alpha grass carbon sequestration ecosystem respiration eddy covariance geogas geothermal activity grasslands net ecosystem carbon balance
类型Article
语种英语
国家Spain ; Italy ; Romania
收录类别SCI-E
WOS记录号WOS:000299042500013
WOS关键词EDDY COVARIANCE TECHNIQUE ; DIOXIDE EXCHANGE ; FLUX MEASUREMENTS ; MOJAVE-DESERT ; CO2 EXCHANGE ; WATER-VAPOR ; SOIL ; TERRESTRIAL ; FOREST ; RATES
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172648
作者单位1.High Spanish Sci Council CSIC, Dept Desertificat & Geoecol, Expt Stn Arid Zones EEZA, Almeria, Spain;
2.Univ Tuscia, Dept Innovat Biol Agrofood & Forest Syst DIBAF, Viterbo, Italy;
3.Ist Nazl Geofis & Vulcanol, Sez Roma 2, Rome, Italy;
4.Univ Babes Bolyai, Fac Environm Sci & Engn, R-3400 Cluj Napoca, Romania
推荐引用方式
GB/T 7714
Rey, Ana,Belelli-Marchesini, Luca,Were, Ana,et al. Wind as a main driver of the net ecosystem carbon balance of a semiarid Mediterranean steppe in the South East of Spain[J],2012,18(2):539-554.
APA Rey, Ana.,Belelli-Marchesini, Luca.,Were, Ana.,Serrano-Ortiz, Penelope.,Etiope, Giuseppe.,...&Pegoraro, Emiliano.(2012).Wind as a main driver of the net ecosystem carbon balance of a semiarid Mediterranean steppe in the South East of Spain.GLOBAL CHANGE BIOLOGY,18(2),539-554.
MLA Rey, Ana,et al."Wind as a main driver of the net ecosystem carbon balance of a semiarid Mediterranean steppe in the South East of Spain".GLOBAL CHANGE BIOLOGY 18.2(2012):539-554.
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